I modified home-reddit-src-reddit-r2-r2-templates-redditfooter.html.py which is the file that generates the html code for the footer. All the py code that generates html code is found in /home/reddit/src/reddit/r2/data/templates. So if we want to change things other than CSS, related to the HTML, I'd say that's the place to look.
There's a line that says "if site!="reddit.com" then run all this footer crap about "powered by reddit codde", and I simply changed it to "if site!=antiextremes.com" which effectively disabled it.
I had to sudo reddit-stop and reddit-start for these python changes to take effect.